One door hinge pin almost fell out within a week of picking up our new 19 on July 23. Luckily the US Customs officer saw it and I temporarily fixed it with a bolt. Part of the problem is the hinges look to be for a left hand door and the the hinges are on a right hand door with the pin lock on the top. When it fails, the pin falls out. Oops!
However ETI sent me a new hinge and it's ready to go.

Like I mentioned before there is no right, left or upside down. The hinge is pinned a pin cap is installed and a roll pin is pressed through the whole assembly holding it together. The problem with ours was there was no roll pin pressed in durning the hinge manufacturing process.

The second picture shows the place where the roll pin was missing at the top.